Same-side castling

Same-side castling occurs when both kings finish on the kingside or both finish on the queenside. A wing is one side of the board. Castling is the special move that shifts the king two squares toward a rook and places that rook on the king's other side.

Unlike opposite-side castling, a symmetrical pawn race is less automatic. The pawns that could advance toward the enemy king usually form the attacker's own pawn shield as well. Moving them may control more territory and open attacking lines, but it exposes the attacking king at the same time.

Attacks therefore often begin with pieces, control of the middle of the board, or a concrete weakness. A pawn break, an advance or capture that changes the pawn arrangement and opens lines, may follow once the pieces are ready to use the opened lines. Slower plans are also common: improve the worst-placed piece, build pressure elsewhere, or provoke a weakness before turning toward the king.

The attack can still be strong

Kings on the same wing do not make the position quiet. The deliberate giving up of a pawn or piece against the shield, called a sacrifice, can produce direct threats, as can a missing defender, an open file, or a back-rank weakness, where the king has few exits. The difference is that the attacker must measure the cost of advancing the pawns around their own king more carefully.

• Compare how many pieces each side has near the kings.
• Check whether a pawn break will open lines against both kings or only one.
• Do not advance the shield if the opponent can open it before your pieces arrive.
• Consider trading queens when your advantage lies in having more pawns or pieces, or a better pawn arrangement, rather than attack.